CTEK US 800 - Charging Cycle; Charging Phases

8 • US
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battery may be defective and should be replaced.
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high self discharge of the battery, indicating a bad battery.
CHARGING CYCLE
US 800 has a four step fully automatic charging cycle. At the start of charging the battery
charger delivers maximum current to the battery and the battery voltage increases
constantlytoasetlevelof14.4V.Atthispointthevoltagewillberegulatedandkept
constant while the charging current is successively lowered. Once the charging current
has dropped below 0.4A the charger switches to maintenance charging.
If the battery is loaded and the battery’s terminal voltage drops to 12.9V the charger
automatically switches back to the beginning of the four step cycle. The charger requires a
reversevoltagefromthebatteryofatleast6Vtostartthechargingcycle,thismeansthat
if the battery is so deeply discharged that the terminal voltage is lower than 6V the charger
cannot charge the battery in question. A normal discharged battery has a terminal voltage
of 10.5V.
Charging phases:
Desulphation - Desulphation with pulsing for sulphated batteries.
Bulk - Main charge when 80% of charging takes place. The charger delivers a constant
currentuntiltheterminalvoltagehasrisentothesetlevel.
Absorption - Complete charge up to virtually 100%. The terminal voltage is maintained
at the set level. During this phase the current drops successively so the terminal voltage
doesnotbecometoohigh.Iftheabsorptionphasehasbeeninprogressformorethan18
hours the charger switches to maintenance charging. This function prevents damage if the
batteryisfaulty.
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